{ "data": { "question": { "questionId": "18", "questionFrontendId": "18", "boundTopicId": null, "title": "4Sum", "titleSlug": "4sum", "content": "

Given an array nums of n integers, return an array of all the unique quadruplets [nums[a], nums[b], nums[c], nums[d]] such that:

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You may return the answer in any order.

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Example 1:

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\nInput: nums = [1,0,-1,0,-2,2], target = 0\nOutput: [[-2,-1,1,2],[-2,0,0,2],[-1,0,0,1]]\n
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Example 2:

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\nInput: nums = [2,2,2,2,2], target = 8\nOutput: [[2,2,2,2]]\n
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Constraints:

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